Process of making absenate of-lead.



.1 UNITED STATES.

ELLERSLIE E. LUTHER AND WILLIAM PATENT OFFICE.

VOLGK, OF WATSONVILLE, CALIFORNIA.

raocnss or me mm; or-Lnsn.

Specification Letters men.

r tentea'iwoilo, 1908.

Application filed July 10, Ida! Io.

To aH whom it may concern:

Be 'it known that we, ELLEEsLm E. Lu'rmsn and WILLIAM H. VOLCK, both citizens of the n United States, residing at Watsonville, in the count; of Santa Cruz and State of California, have invented new and useful Improvements in Processes of Making Arsenate of Lead, of which the followin is a specification.

Our invention re ates to a process for the manufacture of arsenate of lead.

Our. process is carried out as follows: A combimng we' ht of white lead or basic lead carbonate, an a combinin weight of ar senic acid in solution, are hefd in suspension in water, and the reaction roduces the arsenate of lead. The. combining weight of arsenic acid may vary fromthe proportion of one part of the anhydrid of arsenic acid to 1.938 parts of leadoxid, to the proportion of one part of the anhydrid of arsenic acid to 2.9 parts of lead oxidr The latter proportion will produce as its result, orthoarsenate of lead with small traces of pyroarsenateof lead, w 'ch is due to the slight acidity of the solution during the reaction. The lesser p rlpportion results in pyroarsenate of lead. e pro ortions varying between the two W111 resu t in mixtures of the above mentioned arsenates. In this process there are two principal reactions, lst, the formation of orthoarsenate of lead; and 2nd, the formation of pyroarsenate of lead. a

The reactions taking place are as follows:

As is readily seen the second reaction is afiected by the addition of more arsenic acid we claim and desireto secure by Letters Patent isg The process of making arsenate of lead, which consists in reacting with arsenic acid in solution, upon basic lead carbonate held in suspension, these reagents being present in the proportions of their eombinin weights. In testimony whereof we have ereunto set out hands 1n presence of two subscribing witn,

ELLERSLIE E. LUTHER.

WILLIAM H. VOLCK.

- L. F. Bucrman'r,

A. T. Poms.

ter concentration of arsenic v of the tank beyond the In practice, the formation of orthoarsenate Having thus described ourinvention,what 

